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UHSDR/UHSDR-active-devel/mchf-eclipse/drivers/ui/oscillator/osc_si570.c
Xavier f838fa66c4 first commit
2022-11-08 16:13:55 +01:00

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/* -*- mode: c; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4; coding: utf-8 -*- */
/************************************************************************************
** **
** UHSDR **
** a powerful firmware for STM32 based SDR transceivers **
** **
**---------------------------------------------------------------------------------**
** **
** File name: **
** Description: **
** Last Modified: **
** Licence: GNU GPLv3 **
************************************************************************************/
// Common
#include "uhsdr_board.h"
#include "codec.h"
//
#include <math.h>
#include <string.h>
#include <stdio.h>
#include "uhsdr_hw_i2c.h"
#include "osc_si570.h"
// -------------------------------------------------------------------------------------
// Local Oscillator
// ------------------
/* There are two supported alternative choices for the Si570:
USE_SI570_CMOS frequencies up to 160/220 Mhz, used in most boards
USE_SI570_CGRADE frequencies up to 280 Mhz, used in Lapwing
*/
#ifndef RF_BRD_LAPWING
#define USE_SI570_CMOS
#else
#define USE_SI570_CGRADE
#endif
// The SI570 Min/Max frequencies id spec sheet
// The "hard limits" frequencies below/above which the synthesizer cannot be adjusted or else the system may crash
// Lower limits apply to all cases
#define SI570_MIN_FREQ 10000000 //10.0=2.5 MHz
#define SI570_HARD_MIN_FREQ 3500000 // 3.5=0.875 MHz
#ifdef USE_SI570_CGRADE
#define SI570_MAX_FREQ 280000000 // 280=70 Mhz
#define SI570_HARD_MAX_FREQ 280000000 // 280=70 MHz
#endif
#ifdef USE_SI570_CMOS
#define SI570_MAX_FREQ 160000000 // 160=40 Mhz
#define SI570_HARD_MAX_FREQ 220000000 // 220=55 MHz
#endif
#define SI570_RECALL (1<<0)
#define SI570_FREEZE_DCO (1<<4)
#define SI570_FREEZE_M (1<<5)
#define SI570_NEW_FREQ (1<<6)
#define SI570_REG_135 135
#define SI570_REG_137 137
#define FACTORY_FXTAL 114.285
// VCO range
#define FDCO_MAX 5670
#define FDCO_MIN 4850
#define POW_2_28 268435456.0
typedef struct {
uint8_t hsdiv;
uint8_t n1;
float64_t fdco;
float64_t rfreq;
float64_t freq;
} Si570_FreqConfig;
typedef struct OscillatorState
{
Si570_FreqConfig cur_config;
Si570_FreqConfig next_config;
float64_t fxtal; // base fxtal value
float64_t fxtal_ppm; // Frequency Correction of fxtal_calc
float64_t fxtal_calc; // ppm corrected fxtal value
uint8_t cur_regs[6];
bool next_is_small;
float fout; // contains startup frequency info of Si570
unsigned short si570_address;
uint8_t base_reg;
bool present; // is a working Si570 present?
} OscillatorState;
#define SMOOTH_DELTA (0.0035)
// Datasheet says 0.0035 == 3500PPM but there have been issues if we get close to that value.
// to play it safe, we make the delta range a little smaller.
// if you want to play with it, tune to the end of the 10m band, set 100 khz step width and dial around
// sooner or later jumps with delta close to 0.0035 (actually a calculated delta of 0.00334) cause a "crash" of Si570
static const uchar hs_div[6] = {11, 9, 7, 6, 5, 4};
static const float fdco_max = FDCO_MAX;
static const float fdco_min = FDCO_MIN;
OscillatorState os;
/*
* @brief Returns startup frequency value of Si570, call only after init of Si570
*
* @returns Startup frequency in Mhz
*/
//*----------------------------------------------------------------------------
//* Function Name : ui_si570_setbits
//* Object :
//* Input Parameters :
//* Output Parameters :
//* Functions called :
//*----------------------------------------------------------------------------
static uchar Si570_SetBits(unsigned char original, unsigned char reset_mask, unsigned char new_val)
{
return ((original & reset_mask) | new_val);
}
static uint16_t Si570_ReadRegisters(uint8_t* regs)
{
return UhsdrHw_I2C_ReadBlock(SI570_I2C, os.si570_address, os.base_reg, 1, regs, 6);
}
/*
* @brief reads Si570 registers and verifies match with local copy of settings
* @returns SI570_OK if matching, SI570_I2C_ERROR if I2C is not working, SI570_ERROR otherwise
*/
static Oscillator_ResultCodes_t Si570_VerifyFrequencyRegisters(void)
{
Oscillator_ResultCodes_t retval = OSC_OK;
uchar regs[6];
// Read all regs
if (Si570_ReadRegisters(&regs[0]))
{
retval = OSC_COMM_ERROR;
}
if (retval == OSC_OK)
{
// Not working - need fix
// memset(regs, 0, 6);
// trx4m_hw_i2c_ReadData(os.si570_address, 7, regs, 5);
if(memcmp(regs, (uchar*)os.cur_regs, 6) != 0)
{
retval = OSC_ERROR_VERIFY;
}
}
return retval;
}
static uint16_t Si570_SetRegisterBits(uint8_t si570_address, uint8_t regaddr ,uint8_t* reg_ptr,uint8_t val){
uint16_t retval = UhsdrHw_I2C_ReadRegister(SI570_I2C, si570_address, regaddr, 1, reg_ptr);
if (retval == 0)
{
retval = UhsdrHw_I2C_WriteRegister(SI570_I2C, si570_address, regaddr, 1, (*reg_ptr|val));
}
return retval;
}
static uint16_t Si570_ClearRegisterBits(uint8_t si570_address, uint8_t regaddr ,uint8_t* reg_ptr,uint8_t val){
uint16_t retval = UhsdrHw_I2C_ReadRegister(SI570_I2C, si570_address, regaddr, 1, reg_ptr);
if (retval == 0)
{
retval = UhsdrHw_I2C_WriteRegister(SI570_I2C, si570_address, regaddr, 1, (*reg_ptr & ~val));
}
return retval;
}
//*----------------------------------------------------------------------------
//* Function Name : ui_si570_small_frequency_change
//* Object : small frequency changes handling
//* Input Parameters :
//* Output Parameters :
//* Functions called :
//*----------------------------------------------------------------------------
static Oscillator_ResultCodes_t Si570_SmallFrequencyChange(void)
{
uint16_t ret;
Oscillator_ResultCodes_t retval = OSC_OK;
uchar reg_135;
// Read current
ret = Si570_SetRegisterBits(os.si570_address, SI570_REG_135, &reg_135, SI570_FREEZE_M);
if (ret == 0)
{
// Write as block, registers 7-12
ret = UhsdrHw_I2C_WriteBlock(SI570_I2C, os.si570_address, os.base_reg, 1, (uchar*)os.cur_regs, 6);
if (ret == 0)
{
retval = Si570_VerifyFrequencyRegisters();
}
else
{
retval = OSC_COMM_ERROR;
}
}
Si570_ClearRegisterBits(os.si570_address, SI570_REG_135, &reg_135, SI570_FREEZE_M);
return retval;
}
//*----------------------------------------------------------------------------
//* Function Name : ui_si570_large_frequency_change
//* Object : large frequency changes handling
//* Input Parameters :
//* Output Parameters :
//* Functions called :
//*----------------------------------------------------------------------------
static Oscillator_ResultCodes_t Si570_LargeFrequencyChange(void)
{
uint16_t ret;
uint8_t reg_135, reg_137;
Oscillator_ResultCodes_t retval = OSC_COMM_ERROR;
if (Si570_SetRegisterBits(os.si570_address, SI570_REG_137, &reg_137, SI570_FREEZE_DCO) == 0)
{
// Write as block, registers 7-12
if(UhsdrHw_I2C_WriteBlock(SI570_I2C, os.si570_address, os.base_reg, 1, (uchar*)os.cur_regs, 6) == 0)
{
retval = Si570_VerifyFrequencyRegisters();
}
}
// no matter what happened, try to unfreeze the Si570
ret = Si570_ClearRegisterBits(os.si570_address, SI570_REG_137, &reg_137, SI570_FREEZE_DCO);
if (ret == 0 && retval == OSC_OK)
{
if (Si570_SetRegisterBits(os.si570_address, SI570_REG_135, &reg_135, SI570_NEW_FREQ) == 0)
{
// Wait for action completed
do
{
ret = UhsdrHw_I2C_ReadRegister(SI570_I2C, os.si570_address, SI570_REG_135, 1, &reg_135);
} while(ret == 0 && (reg_135 & SI570_NEW_FREQ));
}
}
return ret!=0?OSC_COMM_ERROR:retval;
}
static void Si570_ClearConfig(Si570_FreqConfig *in) {
memset(in,0,sizeof(Si570_FreqConfig));
}
static void Si570_CopyConfig(Si570_FreqConfig *in, Si570_FreqConfig* out) {
memcpy(out,in,sizeof(Si570_FreqConfig));
}
static float64_t Si570_FDCO_InRange(float64_t fdco){
return (fdco >= fdco_min && fdco <= fdco_max);
}
static float64_t Si570_GetFDCOForFreq(float64_t new_freq, uint8_t n1, uint8_t hsdiv){
return (new_freq * (float64_t)(n1 * hsdiv));
}
static bool Si570_FindSmoothRFreqForFreq(const Si570_FreqConfig* cur_config, Si570_FreqConfig* new_config) {
float64_t fdco = Si570_GetFDCOForFreq(new_config->freq, cur_config->n1, cur_config->hsdiv);
bool retval = false;
float64_t fdiff = (fdco - cur_config->fdco)/cur_config->fdco;
if (fdiff < 0.0)
{
fdiff = -fdiff;
}
if (fdiff <= SMOOTH_DELTA && Si570_FDCO_InRange(fdco))
{
new_config->rfreq = fdco / (float64_t)os.fxtal_calc;
new_config->fdco = cur_config->fdco; // since we do only a small step, our fdco remains the same, so that we can keep an eye on the +/-3500ppm rule
new_config->n1 = cur_config->n1;
new_config->hsdiv = cur_config->hsdiv;
retval = true;
}
return retval;
}
static bool Si570_FindConfigForFreq(Si570_FreqConfig* config) {
uchar i;
uint16_t divider_max, curr_div;
bool retval = false;
bool n1_found = false;
uint8_t n1 = 1; // this is to shut up gcc 4.9.x regarding uninitalized variable
uint8_t hsdiv;
float64_t fdco;
divider_max = (ushort)floorf(fdco_max / config->freq);
curr_div = (ushort)ceilf (fdco_min / config->freq);
// for each available divisor hsdiv we calculate the n1 range
// and see if an acceptable n1 (1,all even numbers between 2..128)
// is available for the given divisor.
// this requires at most 12 float division
// for frequencies in the range from 3,45 to 120Mhz at most
for(i = 0; i < 6 && n1_found == false; i++)
{
hsdiv = hs_div[i];
uint8_t n1_cand_min = ceilf((float)curr_div / (float)hsdiv);
uint8_t n1_cand_max = floorf((float)divider_max / (float)hsdiv);
if ((n1_cand_max >= 1) && (n1_cand_min <= 128) ) {
if (n1_cand_min <= 1)
{
n1 = 1;
n1_found = true;
} else {
n1 = ((n1_cand_min+1)& ~1);
// get the closest even number (towards higher numbers)
if (n1 <= n1_cand_max) {
n1_found = true;
}
}
}
}
if (n1_found) {
fdco = Si570_GetFDCOForFreq(config->freq,n1,hsdiv);
if (Si570_FDCO_InRange(fdco)) {
config->n1 =n1;
config->hsdiv = hsdiv;
config->fdco = fdco;
config->rfreq = fdco / os.fxtal_calc;
retval = true;
}
}
return retval;
}
static Oscillator_ResultCodes_t Si570_ConfigToRegs(Si570_FreqConfig* config, uint8_t regs[6]) {
uint32_t frac_bits;
uint16_t whole;
uint8_t n1_regVal = config->n1 - 1;
uint8_t hsdiv_regVal = config->hsdiv - 4;
uint8_t i;
// the written value is n1 - 1, hsdiv -4 according to the datasheet
Oscillator_ResultCodes_t retval = OSC_OK;
for(i = 0; i < 6; i++)
{
regs[i] = 0;
}
regs[0] = (hsdiv_regVal << 5);
regs[0] = Si570_SetBits(regs[0], 0xE0, (n1_regVal >> 2));
regs[1] = (n1_regVal & 3) << 6;
whole = floorf(config->rfreq);
frac_bits = floorf((config->rfreq - whole) * POW_2_28);
for(i = 5; i >= 3; i--)
{
regs[i] = frac_bits & 0xFF;
frac_bits = frac_bits >> 8;
}
regs[2] = Si570_SetBits(regs[2], 0xF0, (frac_bits & 0xF));
regs[2] = Si570_SetBits(regs[2], 0x0F, (whole & 0xF) << 4);
regs[1] = Si570_SetBits(regs[1], 0xC0, (whole >> 4) & 0x3F);
return retval;
}
static Oscillator_ResultCodes_t Si570_WriteRegs(bool is_small) {
Oscillator_ResultCodes_t retval = OSC_OK;
if(is_small)
{
retval = Si570_SmallFrequencyChange();
}
else
{
retval = Si570_LargeFrequencyChange();
}
if(retval == OSC_OK)
{
// Verify second time - we might be transmitting, so
// it is absolutely unacceptable to be on startup
// SI570 frequency if any I2C error or chip reset occurs!
retval = Si570_VerifyFrequencyRegisters();
}
return retval;
}
static Oscillator_ResultCodes_t Si570_PrepareChangeFrequency(float64_t new_freq)
{
Oscillator_ResultCodes_t retval = OSC_OK;
Si570_FreqConfig* next_config_ptr = &os.next_config;
Si570_FreqConfig* cur_config_ptr = &os.cur_config;
next_config_ptr->freq = new_freq;
os.next_is_small = Si570_FindSmoothRFreqForFreq(cur_config_ptr,next_config_ptr);
if (os.next_is_small == false && Si570_FindConfigForFreq(next_config_ptr) == false)
{
retval = OSC_TUNE_IMPOSSIBLE;
}
else
{
retval = Si570_ConfigToRegs(next_config_ptr,os.cur_regs);
}
return retval;
}
/**
* @returns true if the next prepared step will be a large one, requiring sound muting etc. Requires a call to Si570_PrepareNextFrequency to have correct information
*/
static bool Si570_IsNextStepLarge(void)
{
return os.next_is_small == false;
}
/**
* @brief execute the prepared frequency change. May be called multiple times in case of I2C issues
* @returns SI570_OK or SI570_I2C_ERROR if I2C communication failed (which can happen at very high I2C speeds). SI570_ERROR_VERIFY should never happen anymore.
*/
static Oscillator_ResultCodes_t Si570_ChangeToNextFrequency(void)
{
Oscillator_ResultCodes_t retval = OSC_OK;
Si570_FreqConfig* next_config_ptr = &os.next_config;
Si570_FreqConfig* cur_config_ptr = &os.cur_config;
retval = Si570_WriteRegs(os.next_is_small);
// TODO: remove this handling, since it was almost certainly caused
// by a wrong interpretation of the data sheet regarding small steps.
if (retval == OSC_ERROR_VERIFY && os.next_is_small == true)
{
//
// sometimes the small change simply does not work
// for unknown reasons, so we execute a large step
// instead to recover.
retval = Si570_WriteRegs(false);
}
// If everything is fine, get on with remembering our current configuration
if (retval == OSC_OK) {
Si570_CopyConfig(next_config_ptr,cur_config_ptr);
}
else
{
Si570_ClearConfig(cur_config_ptr);
}
return retval;
}
//
// by DF8OE
//
// startupfrequency-subroutine
static void Si570_CalcSufHelper(void)
{
uchar si_regs[6];
int hs_div;
int n1;
float rsfreq;
Si570_ReadRegisters(si_regs);
// calculate startup frequency
rsfreq = (float)((si_regs[5] + (si_regs[4] * 0x100) + (si_regs[3] * 0x10000) + (double)((double)si_regs[2] * (double)0x1000000) + (double)((double)(si_regs[1] & 0x3F) * (double)0x100000000)) / (double)POW_2_28);
hs_div = (si_regs[0] & 0xE0) / 32 + 4;
n1 = (si_regs[1] & 0xC0) / 64 + (si_regs[0] & 0x1F) *4 + 1;
if (n1 %2 != 0 && n1 != 1)
{
n1++;
}
os.fout = roundf((1142850 * rsfreq) / (hs_div * n1)) / 10000;
}
float Si570_GetStartupFrequency()
{
return os.fout;
}
uint8_t Si570_GetI2CAddress()
{
return os.si570_address;
}
/**
* @brief Sets a new PPM value AND corrects the internally used xtal frequency accordingly
* @param ppm ppm value
*/
static void Si570_SetPPM(float32_t ppm)
{
os.fxtal_ppm = ppm;
os.fxtal_calc = os.fxtal + (os.fxtal / (float64_t)1000000.0) * os.fxtal_ppm;
if (Si570_PrepareChangeFrequency(os.cur_config.freq) == OSC_OK)
{
Si570_ChangeToNextFrequency();
}
}
static uint8_t Si570_ResetConfiguration(void)
{
uint8_t retval = 0;
short res;
ulong rfreq_frac;
ulong rfreq_int;
uchar hsdiv_curr;
uchar n1_curr;
// Reset publics
os.fxtal = FACTORY_FXTAL;
os.present = false;
res = UhsdrHw_I2C_WriteRegister(SI570_I2C, os.si570_address, SI570_REG_135, 1, SI570_RECALL);
if(res != 0)
{
retval = 1;
}
else
{
uint8_t ret;
int i = 0;
do
{
res = UhsdrHw_I2C_ReadRegister(SI570_I2C, os.si570_address, SI570_REG_135, 1, &ret);
if(res != 0)
{
retval = 2;
break;
}
i++;
if(i == 30)
{
retval = 3;
break;
}
} while(ret & SI570_RECALL);
if (retval == 0 && Si570_ReadRegisters(&(os.cur_regs[0])) != 0)
{
retval = 4;
}
else
{
hsdiv_curr = ((os.cur_regs[0] & 0xE0) >> 5) + 4;
n1_curr = 1 + ((os.cur_regs[0] & 0x1F) << 2) + ((os.cur_regs[1] & 0xC0) >> 6);
rfreq_int = (os.cur_regs[1] & 0x3F);
rfreq_int = (rfreq_int << 4) + ((os.cur_regs[2] & 0xF0) >> 4);
rfreq_frac = (os.cur_regs[2] & 0x0F);
rfreq_frac = (rfreq_frac << 8) + os.cur_regs[3];
rfreq_frac = (rfreq_frac << 8) + os.cur_regs[4];
rfreq_frac = (rfreq_frac << 8) + os.cur_regs[5];
float64_t rfreq = rfreq_int + (float64_t)rfreq_frac / POW_2_28;
os.fxtal = ((float64_t)os.fout * (float64_t)(n1_curr *hsdiv_curr)) / rfreq;
Si570_SetPPM(os.fxtal_ppm);
os.cur_config.rfreq = rfreq;
os.cur_config.n1 = n1_curr;
os.cur_config.hsdiv = hsdiv_curr;
os.cur_config.fdco = Si570_GetFDCOForFreq(os.fout,n1_curr,hsdiv_curr);
os.present = true;
}
}
return retval;
}
static Oscillator_ResultCodes_t Si570_PrepareNextFrequency(ulong freq, int temp_factor);
/**
* @brief Checks if all oscillator resources are available for switching frequency
* It basically checks if the I2C is currently in use
* This function must be called before changing the oscillator in interrupts
* otherwise deadlocks may happen
* @return true if it safe to call oscillator functions in an interrupt
*/
bool Si570_ReadyForIrqCall()
{
return (SI570_I2C->Lock == HAL_UNLOCKED);
}
static bool Oscillator_IsPresent(void)
{
return os.present;
}
static uint32_t Si570_getMinFrequency(void)
{
#ifdef RF_BRD_LAPWING
return 1240000000L;
#else
return SI570_HARD_MIN_FREQ/4;
#endif
}
static uint32_t Si570_getMaxFrequency(void)
{
#ifdef RF_BRD_LAPWING
return 1300000000L;
#else
return SI570_HARD_MAX_FREQ/4;
#endif
}
static uint32_t Si570_translateExt2Osc(uint32_t freq)
{
#ifdef RF_BRD_LAPWING
return freq - 1124500000L;
#else
return freq * 4;
// frequency multiplied with 4 since we drive a johnson counter for phased clock generation
#endif
}
const OscillatorInterface_t osc_si570 =
{
.init = Si570_Init,
.isPresent = Oscillator_IsPresent,
.setPPM = Si570_SetPPM,
.prepareNextFrequency = Si570_PrepareNextFrequency,
.changeToNextFrequency = Si570_ChangeToNextFrequency,
.isNextStepLarge = Si570_IsNextStepLarge,
.readyForIrqCall = Si570_ReadyForIrqCall,
.name = "Si570",
.type = OSC_SI570,
.getMinFrequency = Si570_getMinFrequency,
.getMaxFrequency = Si570_getMaxFrequency,
};
void Si570_Init()
{
os.base_reg = 13; // first test with regs 13+ for 7ppm SI570
uchar dummy;
// test for hardware address of SI570
os.si570_address = (0x55 << 1);
if(UhsdrHw_I2C_ReadRegister(SI570_I2C,os.si570_address, (os.base_reg),1, &dummy) != 0)
{
os.si570_address = (0x50 << 1);
if(UhsdrHw_I2C_ReadRegister(SI570_I2C,os.si570_address, (os.base_reg),1, &dummy) != 0)
{
os.si570_address = (0x01 << 1);
}
}
if (UhsdrHw_I2C_DeviceReady(SI570_I2C,os.si570_address) == HAL_OK)
{
// make sure everything is cleared and in initial state
Si570_ResetConfiguration();
Si570_CalcSufHelper();
if(os.fout > 39.2 && os.fout < 39.3)
{
// its a 20 or 50 ppm device, use regs 7+
os.base_reg = 7;
Si570_CalcSufHelper();
}
// all known startup frequencies
static const float suf_table[] =
{
10,
10.356,
14.05,
14.1,
15,
16.0915,
22.5792,
34.285,
56.32,
63,
76.8,
100,
122,
125,
156.25,
0
};
// test if startup frequency is known
for (int i = 0; suf_table[i] != 0; i++)
{
float test = os.fout - suf_table[i];
if (test < 0)
{
test = -test;
}
if (test < 0.2)
{
os.fout = suf_table[i];
break;
}
}
// we wait a little and then reset again
HAL_Delay(40);
Si570_ResetConfiguration();
}
osc = os.present?&osc_si570:NULL;
}
/**
* @brief prepares all necessary information for the next frequency change
* @param freq frequency in Hz to which the LO should be tuned.
* @param calib the calibration correction value for the real vs. data sheet frequency of the Si570.
* @param temp_factor the SoftTCXO code calculates a temperature correct value which is used to make a virtual tcxo out of the Si570.
*
* @returns SI570_TUNE_IMPOSSIBLE if tuning to the desired frequency is not possible at all (multiple reasons), SI570_OK if it is possible and within spec, SI570_TUNE_LIMITED if possible but out of spec
*/
static Oscillator_ResultCodes_t Si570_PrepareNextFrequency(ulong freq, int temp_factor)
{
Oscillator_ResultCodes_t retval = OSC_TUNE_IMPOSSIBLE;
if (osc->isPresent() == true) {
float64_t freq_calc, temp_scale;
freq_calc = Si570_translateExt2Osc(freq);
temp_scale = ((float64_t)temp_factor)/14000000.0;
// calculate scaling factor for the temperature correction (referenced to 14.000 MHz)
freq_calc *= (1 + temp_scale); // rescale by temperature correction factor
// when tuning frequency is outside SI570 hard limits, don't do it
if (freq_calc <= SI570_HARD_MAX_FREQ && freq_calc >= SI570_HARD_MIN_FREQ)
{
// tuning inside known working spec
retval = Si570_PrepareChangeFrequency(freq_calc/((float64_t)1000000.0));
if ((freq_calc > SI570_MAX_FREQ || freq_calc < SI570_MIN_FREQ))
{
// outside official spec but known to work
if (retval == OSC_OK)
{
retval = OSC_TUNE_LIMITED;
}
}
}
}
return retval;
}
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